Why does she insist she still loves and cares about me?

It's been almost three weeks since our "permanent" break-up (nearly 2-year LDR) and the other day I finally broke contact for good after pouring my heart and soul in attempting to reason with her—not to convince her to get back together, but to get her to understand she's actively ruining her life by seeking out toxic hookups and new situationships. I wanted her to get better because she was my best friend. She's always been self-aware of her BPD, but even after undergoing therapy for a while she she continued to struggle with her symptoms, and it was so damn obvious.

Just three weeks ago, she decided to end things, and yet was adamant that she still loved me "like a family member", but not romantically anymore, and mentioned a willingness to reconnect after some time when we both get better with our separate issues. She even said repeatedly that I'm still her FP and that she feels tethered to me. After talking more about it the following weeks she quickly shifted, ignoring my texts because she's receiving daily validation and attention from other men. Now I feel that she has truly moved on, and I occupy 0% of her brain space. None of the things she told me just after the break-up are true anymore. One of the most painful things she said in our last conversations was that she dislikes my personality and no longer feels physical attraction to me. Now I question whether any woman will ever feel that way about me again in a veritable manner.

It fucking sucks how everything can change so rapidly. They aren't exactly lies as they were true to her in the moment, but to me they are. It's almost like I spent 2 years of my young adult life enamoured by an AI robot—an inhuman creature who doesn't understand the meaning of true love. The whole experience was a giant, fabricated lie.

Does anyone have a similar experience during the "final discard" of this hellhole of a cycle? Many posts here say that there is typically a rekindling phase, but for us there was never one. We had officially broken up once already, and I foolishly decided to reach out to her after nearly 3 months of NC. At the time, she said she wouldn't have reached out to me if I didn't message her, and that she spent many nights formulating an attempt to reach out but didn't have the heart to do so, as she cared about me a lot and wanted me to "heal" from the abusive cycle. It hit me like thunder when I recently remembered she said this—now I know for certain there will never be another rekindling phase.